Pete Doherty. Amy Winehouse. Scott Weiland. Robert Downey Jr. Hunter Thompson. Keith Richards.
These people were all far more out of control than Sheen at some point in their lives. Four of them were on my yearly deathlist at one point or another. All of them seem to have come out of it OK or lived long and productive lives. Charlie Sheen might drop dead in 18 minutes, but he might keep up this pace for another couple of years and then decide to mellow out. There's risk in everything you do, and while he might be pushing the odds a bit more than we do just driving to work, there's still a perfectly reasonable chance that he comes out of this just fine. He's certainly pushing the envelope, but he seems to be enjoying life.